“Brain tumor” are two words that strike fear into most hearts. They conjure images of thin patients with heads shaved and large fresh scars on their heads, of rapid neurological deterioration, and of sick children. Not all brain tumors are the same, however (find additional info here). Some are aggressive malignant cancer. Those are the bad actors like medullablastoma. They grow and spread quickly, and are very difficult to treat. Others are benign. These grow slowly, and either don’t spread or are very slow to spread. Benign brain tumors include meningioma, which we’re talking about today.
Meningioma is a tumor of the meninges, a thin layer that covers the brain. Meningiomas are benign. They don’t tend to metastasize (spread to other areas of the body). Instead, they grow and can grow enough that they squish parts of the brain. This causes headaches, loss of vision, and changes in thinking and mood.
Brain tumors are rare. So are meningiomas. They affect roughly 97/100,000 people. We don’t yet know exactly what causes them. But by looking are who tends to get them, we have some guesses. Exposure to radiation of the head seems to increase the risk. So does having a condition called Neurofibromatosis II. And meningiomas are more common in cisgender women than in cisgender men. Why? Because of hormones. Like breast cancer, meningioma can grow in response to estrogen or progesterone. Cis men who have been treated for prostate cancer (involving androgen deprivation therapy) are at higher risk. And perhaps trans women are too.
And that’s what brings us to today’s paper. We’ve covered meningiomas in trans women once before, but it’s time to take another look now that we have more data.
Today’s paper discusses three new cases of meningioma in trans women. In total now, 8 cases have been discussed in the medical literature. It’s a very small number, but enough to start seeing some patterns.
Of these three new cases, all were over the age of 45, were post-vaginoplasty, and were on cyproterone acetate along with an estrogen. All had surgery to remove the tumor, and they did well. The decision to continue hormone therapy was made on a case-by-case basis.
The authors noted a previous paper that found that cyproterone acetate was associated with meningioma. This was particularly true with doses above 25mg a day. Among the eight cases of meningioma in trans women in the literature, only one was not on cyproterone acetate. Doses ranged from 10mg to 100mg, with most being on 50mg or 100mg. The authors also found reports of higher rates of meningioma among people who use progesterone-like medications. Removing hormone therapy (especially cyproterone acetate) frequently helps to shrink the tumor.
What should you do with this information?
First, don’t panic about meningioma. It’s rare and benign.
There is no screening for meningioma. Instead, if you have any unusual symptoms like changes in your vision or headaches, talk with your doctor.
If you are a trans woman, consider taking the smallest dose of hormones possible. In general, high doses increase side effects and don’t help with transition. If you are diagnosed with a meningioma, have an honest conversation with your doctors about your hormone therapy.
And, of course, be sure to live as healthy a life as you can. Don’t go jumping into volcanos or nuclear power plants. Eat a balanced diet, get some exercise, avoid most drugs, and take care of yourself.
Want to read the article for yourself? The abstract is publicly available.